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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Producer gas/water gas generators, with/without their purifiers; acetylene ... | $16,807,435 | $25,239,032 | $29,397,747 | $33,410,929 | $38,701,103 | $41,546,128 | $25,397,538 |
| Parts of the producer gas/water gas generators/acetylene gas & sim. water p ... | $11,620,980 | $4,661,382 | $13,262,939 | $13,194,886 | $8,850,355 | $17,675,555 | $18,454,678 |
| Total | $28,428,415 | $29,900,414 | $42,660,686 | $46,605,815 | $47,551,458 | $59,221,683 | $43,852,216 |
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